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Old 28th May 2005, 08:24 AM   #1
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Default Recommendation for inexpensive fet inout opamp

I'm building quite a few portable preamps for my friends recording room and need some fet input opamps that can operate with a single 9v battery. I tried the opa2134 but need something a bit cheaper since most of the portable units will be lent out to various people and probably beaten to hell. Thanks for suggestions.
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Old 28th May 2005, 07:21 PM   #2
jcx is offline jcx  United States
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opa2134 is about as cheap as good op amps come, but they are limited in not swinging very close to the rails so they are a poor choice for single 9V battery supply

AD823 is a little pricier but does have r-r output and is often mentioed in lists of op amps for audiophile apps

but I don't understand worying about saving $2 on op amp price, surely connectors, pwb, assy time cost several times that
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Old 30th May 2005, 05:14 AM   #3
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If size/space allows, I find it well worthwile to use two 9 volts. You'll get better headroom and won't need to use devices to establish a ground at 4.5 volts which would probably involve additional current usage and go out of balance as the battery fades. (Downside is that there goes the single-pole power on)
The TL072 is economical and often seen in high-quality commercial audio products. It has low noise and a slew rate of 13 v/us.
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